- Research question: temporal change in group_size/ counts and distance to water
- Study area: Ruaha NP, TZ
- Data: Survey data by Claudia Stommel 2011-2013
Setup
invisible(sapply(
list("d6", "sf", "dplyr", "readr", "tidyr", "terra" , "ggplot2", "stars", "ggspatial",
"rcartocolor", "colorspace", "systemfonts", "patchwork", "here", "ggdensity"),
library, character.only = TRUE, logical.return = TRUE
))
# ggplot theme
theme_set(theme_d6(legend = c(.48,.95)))
theme_update(
axis.text = element_text(),
legend.text = element_text(size = rel(.95)),
legend.key.height = unit(.2, "lines"),
legend.key.width = unit(1.5, "lines"),
legend.position = c(.48, .95),
legend.direction = "horizontal"
)Figure 1: Map Study Site
Data
## park boundary
park_bounds_ruaha_utm <-
st_read(here("data", "park_bounds_ruaha_32636_edited.gpkg"))
## normalized difference vegetation index
ndvi <- rast(here("data", "ndvi_201307_crop_32636.tif"))
# ndvi <- rast(here("data", "ndvi_201310_crop_32636.tif"))
## transects
transects <-
read.table(here("data", "stommel_mastertable_20230127.txt"),
header = TRUE, dec = ".", na.strings = "NA", stringsAsFactors = TRUE) |>
st_as_sf(coords = c("lon", "lat"), crs = 4326) |>
st_transform(st_crs(ndvi))
transects_buffer <- transects |> st_buffer(2000)
transect_ids <-
tibble::tribble(
~id, ~lon, ~lat,
"5", 35.22, -7.4,
"10", 35.08, -7.55,
"9", 35.022, -7.62,
"4", 34.93, -7.63,
"8", 34.89, -7.76,
"3", 34.77, -7.73,
"7", 34.77, -7.835,
"2", 34.65, -7.753,
"6", 34.67, -7.88,
"1", 34.54, -7.85
) |>
st_as_sf(coords = c("lon", "lat"), crs = 4326)
ndvi_c <- crop(ndvi, transects_buffer)
values(ndvi_c) <- values(ndvi_c) / 10000
## rivers
rivers_ruaha_utm <- st_read(here("data", "rivers_osm_ruaha_32636.gpkg"))
rivers_ruaha_utm_c <- st_crop(rivers_ruaha_utm, transects_buffer)
rivers_ruaha_utm_sub <-
rivers_ruaha_utm_c |>
## remove rivers that are not considered
filter(
!(substr(osm_id, 1, 4) %in% c("4944", "3629", "9659", "3346")),
osm_id != "378460637"
) |>
## add type information to color based on main vs sand rivers
mutate(
type = if_else(name %in% c("Great Ruaha", "Jongomero"), "main", "sand"),
type = factor(type, levels = c("pool", "sand", "main", "transect"))
)
## pools
pools <-
vroom::vroom(here("data", "ruaha_spring_pools.csv")) |>
add_row(WAT_ID = 0000, ID_POOL = "Legend", LON = 35.03, LAT = -7.378) |>
st_as_sf(coords = c("LON", "LAT"), crs = 4326) |>
st_transform(st_crs(park_bounds_ruaha_utm))
## bounding box
bbox <- st_bbox(ndvi_c)Map
map <-
ggplot() +
## ndvi
geom_stars(data = st_as_stars(ndvi_c), alpha = 1) +
scale_fill_continuous_sequential(
trans = "exp", palette = "Terrain 2", begin = .1, guide = "none",
breaks = c(seq(-.4, .8, by = .2)), limits = c(-.4, NA)
) +
ggnewscale::new_scale_fill() +
## river outlines
geom_sf(data = st_buffer(rivers_ruaha_utm_sub, 500), aes(fill = type), lwd = 0) +
scale_fill_manual(
values = c("transparent", "#ebcc3b", "#a1c2e2", "black"), guide = guide_legend(reverse = TRUE),
labels = c("Pools", "Sand river ", "Main river ", "Transects "), name = NULL, drop = FALSE
) +
## park boundaries
geom_sf(
data = park_bounds_ruaha_utm, color = "grey35", fill = NA,
lwd = .6, linetype = "32", lineend = "round"
) +
## rivers
geom_sf(data = rivers_ruaha_utm_sub, aes(color = type), lwd = .8) +
scale_color_manual(
values = c("transparent", "#977d16", "#1568b8", "white"), guide = guide_legend(reverse = TRUE),
labels = c("Pools", "Sand river ", "Main river ", "Transects "), name = NULL, drop = FALSE
) +
## transects
geom_sf(data = transects, color = "black", size = 1.5) +
geom_sf(data = transects, color = "white", size = .05) +
geom_sf_text(
data = transect_ids, aes(label = id),
size = 5, family = "PT Serif", fontface = "bold", color = "gray10"
) +
## pools
geom_sf(data = pools, size = 10, shape = "★", color = "white") +
geom_sf(data = pools, size = 6, shape = "★", color = "firebrick") +
## north arrow + scaale bar
ggspatial::annotation_scale(
location = "br", text_family = "PT Sans", text_cex = .9, width_hint = .4,
pad_x = unit(4.5, "lines"), pad_y = unit(.35, "cm"), text_pad = unit(.35, "cm")
) +
ggspatial::annotation_north_arrow(location = "br") +
## bounding box
coord_sf(expand = FALSE, xlim = bbox[c(1,3)], ylim = bbox[c(2,4)]) +
## axis titles
labs(x = "Longitude", y = "Latitude")
park <-
ggplot() +
## park boundaries
geom_sf(
data = park_bounds_ruaha_utm, color = "grey35", fill = "white",
lwd = .5, linetype = "32", lineend = "round"
) +
## rivers
geom_sf(data = rivers_ruaha_utm_sub, aes(color = type), lwd = .5) +
scale_color_manual(
values = c("#977d16", "#1568b8"), guide = "none"
) +
## bounding box
geom_sf(data = st_as_sfc(bbox), color = "black", fill = NA, linewidth = 1.2) +
## projection
coord_sf(crs = st_crs(park_bounds_ruaha_utm)) +
## theming
theme_void() +
theme(panel.background = element_rect(fill = NA, color = NA))
globe <-
d6berlin::globe(
col_earth = "grey80", #"#B7D19D",
col_water = "white", #"#A9C9EB",
bg = TRUE,
center = c(34.93544, -0.68140)
)
map_globe <- map +
inset_element(park, left = 0, right = .21, bottom = .5, top = .75) +
inset_element(globe, left = 0, right = .21, bottom = .76, top = .99)
map_globe